Abstract
Analyzing level fluctuations of the natural ambient underwater noise shows that the spectrum of the envelope usually consists of two frequency domains of different physical nature. The low-frequency domain is governed by variations in wind speed, that is, variations in surface density of the source power. The high-frequency domain is related to rough-surface sound scattering. The boundary between the domains correspond to frequencies of 0.05–0.1 Hz. Experiments have shown that both cross-frequency noise correlation and correlation between the noise and wind speed fluctuations are high if only frequencies lower than 0.1 Hz are retained in the spectrum, these correlations being low for unfiltered noise. Thus, if there is no ship-traffic noise, the frequency correlation coefficient remains to be 0.6–0.8 within 0.1–10 kHz if the high-frequency domain is cut off and it is close to zero in disjoint filtering bands for unfiltered noise. The experimental data are discussed and interpreted with the use of the noise model allowing for space–time parameters of the wind speed.
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